From 9e17467a434482a54e480aac9edb9473bd3cf323 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Thu, 22 Apr 2021 04:33:25 -0600
Subject: extract readme from head and show it

---
 src/main.rs | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 60 insertions(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 795cf41..b248ae7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+use std::path::Path;
+
 use askama::Template;
 use async_std::sync::{Arc, Mutex};
 use eyre::Result;
@@ -31,16 +33,21 @@ async fn main() -> Result<()> {
     let state = State::discover(root).await?;
     // unfortunately, the State has to be both Send and Sync, but git2::Repository is not Sync
     // and even an Arc<RwLock<State>> isn't Sync if State isn't Sync, it has to be a Mutex to get Sync
-    // TODO do something smarter for that
+    // TODO do something smarter for that like maybe just a vec of repo paths
     let mut app = tide::with_state(Arc::new(Mutex::new(state)));
     app.at("/").get(index);
-    app.at("/*repo").get(|_| async { Ok("bruh") });
-    app.at("/*repo/tree").get(|_| async { Ok("bruh tree") });
+    {
+        let mut repo = app.at("/*repo");
+        repo.get(about);
+        repo.at("/tree").get(|_| async { Ok("bruh tree") });
+    }
     app.listen(("127.0.0.1", port)).await?;
     Ok(())
 }
 
-async fn index(req: tide::Request<Arc<Mutex<State>>>) -> tide::Result {
+type Request = tide::Request<Arc<Mutex<State>>>;
+
+async fn index(req: Request) -> tide::Result {
     let state = req.state();
     let state = state.lock_arc().await;
     for repo in &state.data {
@@ -53,3 +60,52 @@ async fn index(req: tide::Request<Arc<Mutex<State>>>) -> tide::Result {
     }
     Ok(IndexTemplate { state: state.deref() }.into())
 }
+
+async fn about(req: Request) -> tide::Result {
+    let repo_rel_path = req.param("repo").expect("no repo in repo-based URL?");
+    let state = req.state();
+    let state = state.lock_arc().await;
+    let repo = state.data.iter()
+        .find(|repo| state.relative_path(repo.path()) == Path::new(repo_rel_path));
+    let repo = match repo {
+        Some(x) => x,
+        None => return Ok("bruh that's not a real repo".into()),
+    };
+
+    let head = repo.head();
+    let head = match head {
+        Ok(x) => x,
+        Err(err) => return Ok(format!("bruh that repo has no HEAD: {}", err).into()),
+    };
+
+    let head_tree = head.peel_to_tree();
+    let head_tree = match head_tree {
+        Ok(x) => x,
+        Err(err) => return Ok(format!("bruh that repo's HEAD has no tree: {}", err).into()),
+    };
+
+    let tree_readme = head_tree.get_path(Path::new("README.md"));
+    let tree_readme = match tree_readme {
+        Ok(x) => x,
+        Err(err) => return Ok(format!("that repo's HEAD tree has no README.md: {}", err).into()),
+    };
+
+    let tree_readme_object = tree_readme.to_object(repo);
+    let tree_readme_object = match tree_readme_object {
+        Ok(x) => x,
+        Err(err) => return Ok(format!("that repo's HEAD tree has no README.md: {}", err).into()),
+    };
+
+    let head_readme_blob = tree_readme_object.into_blob();
+    let head_readme_blob = match head_readme_blob {
+        Ok(x) => x,
+        Err(_) => return Ok("somehow that README wasn't a file".into()),
+    };
+
+    let body = if head_readme_blob.is_binary() {
+        tide::Body::from(head_readme_blob.content())
+    } else {
+        tide::Body::from(String::from_utf8_lossy(head_readme_blob.content()).into_owned())
+    };
+    Ok(body.into())
+}
-- 
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